My other self was correct

Our main character Harun climbed to the top of the world and gained the tittle universal lord which granted him the power to rule the world. 50 years after that Harun has implemented a tyrannical yet working system that kept the world safe by restricting their freedom. But when a man from and alternate world that looks just like him explains the secrets of the uni- no multiverse, he is immediately killed by the man and sent back 50 years back in time to prepare for the upcoming threat that will soon happen.